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Date: Fri, 15 Nov 2002 17:43:25 +1100
From: Don McKenzie
X-Mailer: Mozilla 4.78 [en] (Windows NT 5.0; U)
Subject: Re: Connecting a PC-speaker to a PIC cpu
> I am trying to connect a PC Speaker (0.5W, 8Ohm) to a PIC cpu (16f877). (I
> am not sure about the Watt of the speaker, I do not got it in front of me at
> the moment)
> I am using PWM modulation in the PIC to achieve a sinus wave. The output is
> a flawless sinus from the RB1 port (measured with a oscilloscope). But when
> I connect the PC speaker I get no sound. This, I assume is because the PIC
> cpu generates to low current(?). Anyone got a suggestion on a circuit that I
> can use so I get my sinus-wave-sound? I've tried using a LM386 effect
> amplifier, using the circuit for a gain of 50, on the data page. But the
> signal out from the amplifier doesn't look to good.
> * Should I have a capacitance between the input of the amplifier and the
> * Is there a easier way of using the PC speaker?
have a look at:
and check out:
Don McKenzie E-mail: http://www.dontronics.com/e-mail.html
Home Page: http://www.dontronics.com
Add USB to your favorite Micro. http://www.dontronics.com/dlp.html
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